echarts在左下角添加单位

option = {
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
        name: '(个)',
        nameLocation: 'start', // 在头部
        //间距
        nameTextStyle: {
            align: 'center',
            color:"green", 
            verticalAlign: 'top',
            padding: 10,
        },
    },
    yAxis: {
        type: 'value'
    },
    series: [{
        data: [120, 200, 150, 80, 70, 110, 130],
        type: 'bar',
        showBackground: true,
        backgroundStyle: {
            color: 'rgba(180, 180, 180, 0.2)'
        }
    }]
};